Turbocompressor control



E. H. SHERBONDY.

TURBOCOMPRESSOR CONTROL.

APPLICATION FILED MAY 14, 1918.

1,419,316. PatentedJune 13, 1922.

2a Z8 27 2 1 26 iii-"11 WITNESS INVENTOR M Earl ff. She/Dandy A TTORNEK EARL H. SHERBONDY,

F CLEVELAND, OHIO.

'runnocomrassson CONTROL.

' Application filed May 14,

' Controls, of which the following is a specification.

This invention relates to controlling means for fluid pumps in general, and more particularly to controlling means for an air compressor.

More particularly the invention comprises -automatic controlling means for said air compressor, a means in which a pressure responsive element is subjected to the delivery pressure of said air compressor, it in turn controlling means to vary the speed, and consequently the delivery pressure of the air compressor. 1

To this end some form of tap-off device is used. This invention comprises a tap-off device which is so designedthat by adjusting it to different positions in the delivery stream from the air compressor, that a pressure is transmitted to. the pressure responsive element which, as desired, may be equal to or greater or less than the actual pressure in the delivery pipe from the'compressor. The advantage of such a tap-ofi device is that by suitably positioning it, the compressor may be caused to deliver its normal output or an output greater or less than normal.

More particularly the invention comprises a tap-ofl' pipe with a mouth which may be adjusted to face into or away from the stream in the delivery pipe, or in any inter-. mediate position, each different position resulting in more or less air being taken into the tap-off pipe, whereby more or less pres- I sure is transmitted to the pressure responsive element. A Other objects and advantages will appear as the description proceeds.

In the drawings representing embodiments of this invention, Fig. 1 shows the automatic control in relation to the air com.- pressor or other fluid pump; Fig. 2 is a sectional detail on an enlarged scale, of the adjustable tap-off pipe; Fig. 3 is a view on line 3-3 of Fig. 2; and Fig. 4 represents a modification.

In the drawings which are diagrammatic, a centrifugal blower wheel or compressor 1 is mounted on a shaft 2, which shaft 2 may Specification of Letters Patent.

a diaphragm 11.

-co-pending case,

Patented June 13,1922. 1918. Serial No. 234,560.

be rotated by a suitable motor 3. Casing elements 4 and 5 are associated with said wheel to define a casing therefor, and the usual collectin ring'6, from which leads the delrvery pipe 7. A pipe 8 opens into this dellvery pipe 7, and at its other end opens 1nto an air tight chamber 9, which may be defined by a casing 10 in cooperation wlth a pressure responsive element, such as At its lower side diaphragm 11 is subject to the pressure transmitted through the pipe 8, and at its upper slde may be provided with suitably loading means, such as springs 12, or aconfined body of air, or both.

The diaphragm 11 has connected therewith a stem 13, which .partakes of the movements thereof to control any suitable means for COIltI'OlllIlg the output of the air compressor. In this case stem 13 is shown as controlling the arm 14 on rheostat 15 which 1s suitably connected to a suitable source of electrical energy, whereby it is evident, movement of the diaphragm will control the speed, and consequently the delivery pressure of the compressor. It should be understood, however, that this stem 13 may control other means for controlling the speed of the compressor, such as that shown in my Serial No. 224894 filed March 26, 1918.

'The tap-01f pipe with which this invention is more particularly concerned, is indicated at 16. This pipe 16 may be mounted in a suitable opening 17 in the delivery pipe I 7, on a base 18, which may be attached to or integral with the 16 projecting into the pipe 7 is cut off diagonally to define an air intake mouth 19. The pipe 16 is bored out a little more than half way up, and is provided with one or more radial holes 20. Pipe 16 is mounted in a suitable standard 21, which is provided with lugs 22, and bolt or screw holes 23, for mounting the pipe 16 on the part 18, a washer 24 may be used, if desired, to make an air tight fit.- The pipe 16 is adapted to be rotated on its own axis, within the standard 21, so that the mouth 19 may be causedto face into, away from or in any intermediate position with respect to the direcpipe 7. The end of pipe tion of travel of the air or other fluid in j being clamped tightly to the head 25, so that the pipe 16 will turn therewith. The handle 26 may be provided with a pointer 28, which moves over a graduated disc 29, rigidly fastened on the standard 21.

Standard 21 is provided with a suitable groove 30, which groove is in connection with the radial ports 20, leading from the interior of the pipe 16. The standard 21 is provided with a laterally extending nipple 31, which opens into said groove 30. The nipple 31 in turn communicates with the pipe 8, the two being held together by a suitable collar 32. It will now be evident that with the parts positioned as in Fig. 2, dynamic force of the air, due to its velocity in the pipe 7, will cause a pressure in excess of the actual static pressure in the delivery pipe 7, to be delivered through the ports 20, groove 30, and pipe 8, to the pressure respon sive element. ment accordingly responds as if the compressor were delivering excess of air and accordingly operates to slow it down. Vere the mouth 19 turned in the opposite direction, the rush of air past the mouth 19 would have somewhat of an injector action to draw out air from the pipe 16, to correspondingly reduce the pressure in the chamber 9, whereupon the pressure responsive element would respond as if the air compressor were delivering insufficient air, and cause the motor 3 to speed up. Adjustment between these two extremes may obviously be had by positioning the mouth 19 in proper intermediate positions.

It may be mentioned in this connection, that variations in the spring or other loading of the pressure responsive element 11 will result in a corresponding supercharging or undercharging of the compressor, as more particularly described in my co-pending case, Serial No. 281,771, filed April 29, 1918. The control through adjustment of the pipe 16 is intended to be used in conjunction with and in addition to the spring loading adjustment just mentioned. This pipe adjustment is very simple and very quickly made, and presents little likelihood of etting out of order.

In the modification shown in Fig. 4, the pipe 8 terminates in two mouths 8 and 8 the plane of the mouth 8 being substantially parallel to the direction of travel in the pipe 7, and the mouth 8" being at right angles thereto. The mouth 8 is responsive mainly to static pressure, and the mouth 8 is respon- The pressure responsive elesive mainly to dynamic pressure. The pi e 8 may be rotated on its own axis so that tiie mouth 8 is caused to face into, away from or in the various intermediate positions with respect to the direction of travel of the air in the pipe 7, whereby an effect similar to the efiect obtained with adjustment of pipe 16 is obtained.

While I have shown the invention as applied to an air compressor, it should be understood that it may be applied to fluid pumps in general.

IVhile I have shown possible embodiments of my invention, it should be understood that it may be carried out in other ways, as defined within the scope of the appended claims.

I claim 1. In combination, a fluid pump, a delivery pipe for the pump, a pressure responsive means to control said pump, and devices connected to said pressure responsive means adapted to be adjustably positioned in the fluid column within said delivery pipe to vary the intensity of the pressures communicated to said pressure responsive means in accordance with the angular position of said device relative to the axial flow of said fluid Column.

2. In combination, a' fluid pump, a pressure responsive means to control said fluid pump and means that may be adjusted to face into the delivery stream from said pump, away from said stream or in intermediate positions to subject said pressure responsive means to a pressure bearing a definite relation to the delivery pressure from said pump.

3. In combination, a fluid pump, a delivery pipe therefor, a pressure responsive means to control said pump, means associated with said delivery pipe having an opening which may be caused to face in any desired direction with respect to the direction of travel of the fluid in said delivery pipe, said means being connected to said pressure responsive means.

4. In combination, a fluid pump, a delivery pipe therefor. a pressure responsive means to control said pump, a tap-off pipe, having a diagonally cut end associated with said delivery pipe and means connecting said tap-ofl' pipe to said pressure responsive means, said tap-off pipe being adjustable.

In testimony whereof I afiix my signature.

EARL H. SHERBONDY. 

